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/*
* Copyright (c) 2004-2007 Sun Microsystems, Inc. All rights reserved.
*
* The Sun Project JXTA(TM) Software License
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* 3. The end-user documentation included with the redistribution, if any, must
* include the following acknowledgment: "This product includes software
* developed by Sun Microsystems, Inc. for JXTA(TM) technology."
* Alternately, this acknowledgment may appear in the software itself, if
* and wherever such third-party acknowledgments normally appear.
*
* 4. The names "Sun", "Sun Microsystems, Inc.", "JXTA" and "Project JXTA" must
* not be used to endorse or promote products derived from this software
* without prior written permission. For written permission, please contact
* Project JXTA at http://www.jxta.org.
*
* 5. Products derived from this software may not be called "JXTA", nor may
* "JXTA" appear in their name, without prior written permission of Sun.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES,
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
* FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL SUN
* MICROSYSTEMS OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
* OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
* EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* JXTA is a registered trademark of Sun Microsystems, Inc. in the United
* States and other countries.
*
* Please see the license information page at :
* for instructions on use of
* the license in source files.
*
* ====================================================================
*
* This software consists of voluntary contributions made by many individuals
* on behalf of Project JXTA. For more information on Project JXTA, please see
* http://www.jxta.org.
*
* This license is based on the BSD license adopted by the Apache Foundation.
*/
package net.jxta.util;
/**
* This the interface that all selectable objects expose.
*
*
* Applications programmers should treat this API as temporary, for now.
*
*
* A SimpleSelectable object can register SimpleSelector objects so that
* they are notified whenever this object chooses to report a change.
*
*
* SimpleSelectors are SimpleSelectable, therefore selectors can be selected.
*
*
* The change notification interface used to notify a selector is actually
* specified in SimpleSelectable. As a result, certain implementations may also
* allow to register SimpleSelectables that are not Selectors. Selectors themselves do not allow that.
*
* @see SimpleSelector
* @see AbstractSimpleSelectable
*/
public interface SimpleSelectable {
/**
* A simple reference object that can be put in a map instead of the one it refers to.
* SimpleSelectable object often need to be put in maps where distinct objects are to be treated
* as such, even if they are identical at a semantical level. However, some
* SimpleSelectable objects may have semantically equals() and hashCode()
* methods rather than the identity ones.
*
*
* For that reason, whenever a SimpleSelectable needs to be used as a map or set key, its identity
* reference should be used instead. All SimpleSelectable can return an identity reference. A given
* SimpleSelectable always provides the same IdentityReference object. IdentityReference never overloads
* hashCode() and equals() in a way that could make different objects be equal or that could provide
* different results from invocation to invocation.
*/
public static class IdentityReference {
private final SimpleSelectable object;
/**
* Creates a new IdentityReference object
*
* @param object the selectable
*/
public IdentityReference(SimpleSelectable object) {
this.object = object;
}
/**
* @return The object that this one refers to.
*/
public SimpleSelectable getObject() {
return object;
}
}
/**
* @return A canonical IdentityReference for this object.
* A given SimpleSelectable always provides the same IdentityReference
* object. An IdentityReference must never overload hashCode() or equals()
* in a way that could make different objects be equal or that could provide
* different results from invocation to invocation.
*/
public IdentityReference getIdentityReference();
/**
* Registers the given selector with this selectable object. This always
* causes one change event for this object to be reported through the
* selector. As a result, when selecting for a condition, it is not
* necessary to verify whether it has already happened or not; the next call
* to select will be able to detect it.
*
* @param s The SimpleSelector to register
*/
public void register(SimpleSelector s);
/**
* Unregisters the given selector, so that it is no-longer notified when
* this object changes.
*
* @param s The SimpleSelector to unregister
*/
public void unregister(SimpleSelector s);
/**
* This method is invoked when the given selectable object has changed. This
* permits to cascade selectable objects, so that one reports a change when
* the other changes, without having to select it. This also permits
* implementation of this interface by delegating its implementation to a
* utility class.
*
* An implementation may do what it wants about it. For example, a
* {@link SimpleSelector} will report the change to
* {@link SimpleSelector#select} and invoke
* {@link AbstractSimpleSelectable#notifyChange()} thereby reporting its own
* change to cascaded selectors. Other implementations may only invoke
* {@link AbstractSimpleSelectable#notifyChange()} or may perform more
* complex tasks.
*
* @see AbstractSimpleSelectable
*
* @param changedObject the object that has changed.
*/
public void itemChanged(SimpleSelectable changedObject);
}
